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Old 06-02-2013, 10:28 PM   #1
Jamesdman24
 
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ZL1 Rear end noise

I have a 2012 ZL1. The rear end makes this weird humming noise, similar to the sound when your power steering is low, coming from the rear when the wheels are cranked in either reverse or forward. Any help would be great!!!
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Old 06-03-2013, 04:13 AM   #2
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Same here when she is cold. Once heated up it goes away! 2013 ZL1
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Old 06-03-2013, 08:00 AM   #3
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Same here when she is cold. Once heated up it goes away! 2013 ZL1
I had the same issue. I found the TSB that relates to the issue that the SS has and the dealership honored the work. They replaced the fluid in the rear diff and also changed out the seals (per the TSB).

Since then, I haven't had the sound reappear. I think GM should look at extending the TSB to officially support the ZL1 as well.
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Old 06-03-2013, 10:49 PM   #4
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theres a private bulletin for the zl1's. Calls to flush the fluid about 3 times and in between those drive it so many miles doing so many figure 8's and a lot of nonsense, all in all majority of the time they are replacing the whole rear end, and when you get it supose to take apart the cover and brake clean inside to get the paint off. The paint they used inside on the gear in the differential to set it, isn't breaking down like its supose to contaminating the lsd.
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Old 06-04-2013, 12:33 AM   #5
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theres a private bulletin for the zl1's. Calls to flush the fluid about 3 times and in between those drive it so many miles doing so many figure 8's and a lot of nonsense, all in all majority of the time they are replacing the whole rear end, and when you get it supose to take apart the cover and brake clean inside to get the paint off. The paint they used inside on the gear in the differential to set it, isn't breaking down like its supose to contaminating the lsd.
Do you have the tsb# ???
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Old 06-04-2013, 11:16 AM   #6
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Im interesyed in thos also. I also notice some sort of loud winning noise espesially in 4yh or 5th gear. Dont recall as im giving it gas.
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Old 06-04-2013, 11:32 AM   #7
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Just change the fluid, it will go away! takes 20 mins to do. you have to get the diff fluid with ls additive already in it.
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Old 06-04-2013, 12:00 PM   #8
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Im interesyed in thos also. I also notice some sort of loud winning noise espesially in 4yh or 5th gear. Dont recall as im giving it gas.
May not be related to the fluid issue. Could be improper lash setup in the rear. Changing fluid will not help this problem.
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Old 06-04-2013, 12:23 PM   #9
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Just change the fluid, it will go away! takes 20 mins to do. you have to get the diff fluid with ls additive already in it.
When changing the fluid, how do you flush the old fluid out of the lines and cooler going up to the front?
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Old 06-04-2013, 12:34 PM   #10
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I had this issue, dealer changed out the fluid and the problem went away.
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Old 06-04-2013, 01:42 PM   #11
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When changing the fluid, how do you flush the old fluid out of the lines and cooler going up to the front?

I just drained at the diff, and filled at the upper plug, noise stopped. If you feel draining at the diff is not good enough and want to get the lines and cooler drained, take it to the dealer. Im sure they use some sort of positive feed pump, but i dont think thats needed.
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Old 06-04-2013, 04:49 PM   #12
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Draining the lines and cooler would have no effect on the noise. The cooler is running transmission fluid and doesn't mix with the rear diff fluid.
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Old 06-04-2013, 10:31 PM   #13
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Thanks guys. Sounds like my dealership is changing my fluid!!!
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Old 06-05-2013, 07:46 AM   #14
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Draining the lines and cooler would have no effect on the noise. The cooler is running transmission fluid and doesn't mix with the rear diff fluid.
Correct me if I'm wrong, but if there is a feed and return line going from the diff to the front of the car and ran thru a heat exchanger, than there will be old gear fluid in those lines and hx unless flushed.
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Old 06-05-2013, 08:06 AM   #15
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Originally Posted by Al C. View Post
Just change the fluid, it will go away! takes 20 mins to do. you have to get the diff fluid with ls additive already in it.


My fluid was changed by the dealership, and when i turn left or right
at about 5mph i hear a whine or humm.
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Old 06-05-2013, 10:43 AM   #16
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Originally Posted by Th3Beast View Post
Correct me if I'm wrong.
Ok

From Chevy's site:

The differential cooler is a truly unique design. This innovative system pumps overcooled transmission fluid to a heat exchanger inside the housing, removing excess heat from the differential fluid
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Old 06-05-2013, 10:53 AM   #17
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I had the same issue, back to the dealer twice, first time the backlash was off, replace ring and pinion, noise went away but came back. Next time they flushed the rearend very good. They think some of the left over lashing compund was causing the whine. It has been quiet ever since and that was about 10,000 miles ago.
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Old 06-05-2013, 03:20 PM   #18
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Originally Posted by DangerZL1 View Post
Ok

From Chevy's site:

The differential cooler is a truly unique design. This innovative system pumps overcooled transmission fluid to a heat exchanger inside the housing, removing excess heat from the differential fluid
Wait a minute... I'm a little confused on that. So the differential fluid is not getting pumped to the front of the car?
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Old 06-05-2013, 04:09 PM   #19
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Wait a minute... I'm a little confused on that. So the differential fluid is not getting pumped to the front of the car?
Correct...its trans fluid that goes back to the rear diff and picks up some heat off the center section and housing
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Old 06-05-2013, 04:11 PM   #20
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No. ATF is the meduim used for cooling. Otherwise the system would take more than around 2 qts of fluid to do a rear differential fluid service. I also wonder how well gear oil would circulate, especially compared to a thinner trans fluid.
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Old 06-14-2013, 10:05 PM   #21
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